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The OEM JCW 380cc injectors were/are much more spendy than non-OEM alternatives. Thanks to a post last year by @Oldboy Speedwell, several of us were able to score a set at highly reduced pricing. Sadly, that selling dealer is now BMW-only, thus can't sell OM MINI parts...
Yes +1 for AllMag...or eBay for genuine used 380 Siemens.
I may not be of much help - I stumbled across my 380's while picking at a local salvage yard. $30 cash & carry.
While I didn't have them professionally "rebuilt" - I did refurbish them with new screens and O-rings after thoroughly flushing and back flushing with carb cleaner and using a 9v battery to "bench test" /activate them.
Might be an option for you if you can score a set of pre-owned.
Good luck.